8. Thermochemistry

An exothermic reaction causes the surroundings to:

A 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of 0.300 M HNO3 in a coffee cup calorimeter. If both solutions were initially at 35.00°C and the temperature of the resulting solution was recorded as 37.00°C, determine the ΔH°rxn (in kJ/mol) for the neutralization reaction.

Barium dioxide decomposes into barium oxide and oxygen gas according to the following reaction: 2 BaO2 → 2 BaO + O2. If 37.6 grams of BaO2 decompose and 182 kJ of heat is absorbed in this process, what is the enthalpy change (ΔH) of this reaction in kJ/mol of BaO2?

In an endothermic chemical reaction, from where does the system obtain the heat energy required for the reaction to occur?

Which of the following reactions is an endergonic reaction?

When 100.0 mL of 0.200 M NaOH is mixed with 50.0 mL of 0.400 M HF in a calorimeter, the temperature increases from 22.50 °C to 24.68 °C. Based on this temperature change, what type of reaction is occurring?

When a liquid undergoes a phase change to become a gas, how are energy and temperature affected during the process?

Which of the following best explains why cooking is considered an endothermic process?

After adding the NaOH to the H2SO4 solution, the temperature of the mixture increases to 32.5°C. What type of reaction is occurring in the coffee cup?

The heat of vaporization of liquid isopropyl alcohol is 159 cal/g. Calculate the energy required to vaporize 39.5 g of this compound.

Which of the following processes is endothermic?

Calculate the total amount of heat needed, in joules, to convert 75.0 grams of ice at -20°C to steam at 100°C. Given: the heat of fusion of water is 6.01 kJ/mol, the heat of vaporization is 40.7 kJ/mol, and the specific heats are: ice = 2.09 J/g°C, water = 4.18 J/g°C, steam = 2.00 J/g°C.

A 25.0 g piece of aluminum (which has a molar heat capacity of 24.03 J/mol °C) is heated to 85.1 °C and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/g °C) initially at 25.0 °C. Assuming no heat is lost to the surroundings, what is the final temperature of the system?

In an endothermic reaction, which of the following statements is correct?